Penstemmon
By Sjw
gloucestershire,
United Kingdom 
I have several different ones growing, but some of the leaves are turning red, is this a disease, underwatered or any other problem that anyone knows about.
22 Jun, 2009
Previous question
they tend to do this on the older leaves. these are the ones that have overwintered. mine have always done this. the colour change is a normal process [autumn colours].
dont worry.
22 Jun, 2009